Yeah it is the main feature of that Walk Search History plugin, but I use it *all* the time. The main usage is when I am looking something up in multiple libraries - after switching libraries I just bash Alt+Left arrow and my same search is repeated. I also use it as a poor man's equivalent for multiple search tabs which calibre does not support - so if I get distracted into searching for a different book or whatever I can just Alt+left back to my previous search when done. Plus when testing plugins I am forever restarting calibre and frequently wanting to get a particular search result back to test again.

It would be nice to go the whole hog and have forward/back mouse button support available as another option/alternative for it. I don't know how possible that is... I'm sure Kovid can tell me

Yuo can navigate search results using the "Walk Search History" plugin, I assign Alt+Left arrow and Atl+Right arrow to go forward/backward between search resutls (same keys as a web browser).

Yes, pretty much what I was looking for. Funny, I'd looked at the plugins before but didn't put it together that it was what I needed. I think the word "search" threw me off as I usually click on items in the tag browser to navigate... essentially that is search, but I wasn't thinking about it like that. I was thinking it was just for my previous specific searches entered for a title or word or such.